91ÁÔÆæ91ÁÔÆæ ROTC DepartmentsNavy ROTC at 91ÁÔÆæ The STA-21 Program Welcome Aboard Provided below is a check-in procedure to assist you in your transition from NSI to NROTC Unit, 91ÁÔÆæ. Any questions you have may be directed to the Senior Naval Instructor at or (843) 953-6629 or the Nuclear Power Officer at or (843) 953-3250.